v4l: Fix conflicting values of two controls

Due to an errant conflict resolution, V4L2_CID_MPEG_VIDC_VIDEO_H264_\
VUI_TIMING_INFO and V4L2_CID_MPEG_VIDC_VIDEO_SYNC_FRAME_DECODE share
the same constant value.  This commit assigns a new constant to
VUI_TIMING_INFO.

Change-Id: I34170dc1e5de9d5d0ff37d56112cf2b59ea7eefc
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>